parasitic copepods (salmincola sp.) and fish species ... · copepods •salmincola prevalence...
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Parasitic Copepods (Salmincola sp.) and Fish Species Composition in Upper Willamette Reservoirs
Jeremy D. Romer* Ryan Emig*
Fred R. Monzyk
Oregon Department of Fish and Wildlife Corvallis Research Lab
2. Compare Fish Community Among Upper Willamette Reservoirs. •Numbers of Native and Introduced Species •Relative abundance •Possible effects on juvenile spring Chinook •Management implications
1. Present Observations of Gill Parasites (Salmincola sp.) in Cougar and Detroit Reservoirs.
2. Fish Community in Upper Willamette Reservoirs
1. Gill Parasites
Gill Nets Oneida Traps Boat E-fishing
Screw Trapping Below Cougar Reservoir.
Juvenile Spring Chinook Captured Below Cougar Dam
40
60
80
100
120
140
160
180
200
26-Jun 16-Jul 5-Aug 25-Aug 14-Sep 4-Oct 24-Oct 13-Nov 3-Dec 23-Dec
NO Copepods
Copepods PRESENT
Jul 21%
Sep 31%
Oct 74%
Nov 76%
Dec 91%
Aug 9%
Fork
Len
gth
(m
m)
Date
Juvenile Spring Chinook Captured Below Cougar Dam
Map with snorkeling sites marked above the Res
0
10
20
30
40
50
60
70
80
90
100
Jul Aug Sep Oct Nov Dec
SF McKenzie River
Below Dam
N= 14
N= 16
N= 417 N=60
Juvenile Spring Chinook Upstream vs. Downstream of Cougar Res.
Month
Perc
ent
Infe
cted
N= 689 N= 87
N= 32
N= 87
Juvenile Spring Chinook Captured Below Detroit Dam
Date
Nov 70%
Dec 53%
40
60
80
100
120
140
160
180
200
220
26-Jun 16-Jul 5-Aug 25-Aug 14-Sep 4-Oct 24-Oct 13-Nov 3-Dec 23-Dec
No Copepods
Copepods Present
Map with snorkeling sites marked above the Res
0
10
20
30
40
50
60
70
80
90
100
Sep Oct Nov Dec
Breitenbush River
North Santiam River
Below Dam N= 71
N= 9
N= 112
N= 32
S. californiensis from masu salmon (photo S.Urawa)
S. Edwardsii (Olsson 1969)
Perc
ent
Infe
cted
2. Compare Fish Community Among Upper Willamette Reservoirs. •Numbers of Native and Introduced Species •Relative abundance •Possible effects on juvenile spring Chinook •Management implications
Species Composition in Upper Willamette Valley Reservoirs
Species Number captured Size (mm)
Detroit Cougar Lookout Point Min. - Max
Native Rainbow Trout (Oncorhynchus mykiss) 1880 132 198 36 - 440 Cutthroat Trout (Oncorhynchus clarkii) 1 73 39 67 - 394
Bull Trout (Salvelinus confluentus) 0 12 0 215 - 537 Mountain Whitefish (Prosopium williamsoni) 13 158 1 33 - 330
Northern Pikeminnow (Ptychocheilus oregonensis) 0 0 577 33 - 590 Sucker (Catostomus spp.) 0 0 527 60 - 565 Dace (Rhinichthys spp.) 14079 28707 62 31 -95
Redside Shiner (Richardsonius balteatus) 0 0 357 52 - 113
Sculpin (Cottus spp.) 5 4 53 46 -223
Exotic Kokanee (Oncorhynchus nerka) 400 0 0 42 - 165
Bass (Micropterus spp.) 0 8 160 30 - 475 Walleye (Sander vitreus) 0 0 26 187 - 755
White Crappie (Pomoxis annularis) 0 0 271 47 - 380 Black Crappie (Pomoxis nigromaculatus) 0 0 6 75 - 290
Bluegill (Lepomis macrochirus) 127 0 11 53 - 170 Pumpkinseed (Lepomis gibbosus) 5297 0 3 64 - 135
Brown Bullhead (Ameiurus nebulosus) 254 0 89 25 - 395 Yellow Bullhead (Ameiurus natalis) 0 0 9 120 - 260
Detroit Reservoir
Detroit Dam Tailrace
457 mm, 18 in.
178 mm, 7 in.
Photo: Greg Gilham
Species Composition in Upper Willamette Valley Reservoirs
Species Number captured Size (mm)
Detroit Cougar Lookout Point Min. - Max
Native Rainbow Trout (Oncorhynchus mykiss) 1880 132 198 36 - 440 Cutthroat Trout (Oncorhynchus clarkii) 1 73 39 67 - 394
Bull Trout (Salvelinus confluentus) 0 12 0 215 - 537 Mountain Whitefish (Prosopium williamsoni) 13 158 1 33 - 330
Northern Pikeminnow (Ptychocheilus oregonensis) 0 0 577 33 - 590 Sucker (Catostomus spp.) 0 0 527 60 - 565 Dace (Rhinichthys spp.) 14079 28707 62 31 -95
Redside Shiner (Richardsonius balteatus) 0 0 357 52 - 113
Sculpin (Cottus spp.) 5 4 53 46 -223
Exotic Kokanee (Oncorhynchus nerka) 400 0 0 42 - 165
Bass (Micropterus spp.) 0 8 160 30 - 475 Walleye (Sander vitreus) 0 0 26 187 - 755
White Crappie (Pomoxis annularis) 0 0 271 47 - 380 Black Crappie (Pomoxis nigromaculatus) 0 0 6 75 - 290
Bluegill (Lepomis macrochirus) 127 0 11 53 - 170 Pumpkinseed (Lepomis gibbosus) 5297 0 3 64 - 135
Brown Bullhead (Ameiurus nebulosus) 254 0 89 25 - 395 Yellow Bullhead (Ameiurus natalis) 0 0 9 120 - 260
Cougar Reservoir
Species Composition in Upper Willamette Valley Reservoirs
Species Number captured Size (mm)
Detroit Cougar Lookout Point Min. - Max
Native Rainbow Trout (Oncorhynchus mykiss) 1880 132 198 36 - 440 Cutthroat Trout (Oncorhynchus clarkii) 1 73 39 67 - 394
Bull Trout (Salvelinus confluentus) 0 12 0 215 - 537 Mountain Whitefish (Prosopium williamsoni) 13 158 1 33 - 330
Northern Pikeminnow (Ptychocheilus oregonensis) 0 0 577 33 - 590 Sucker (Catostomus spp.) 0 0 527 60 - 565 Dace (Rhinichthys spp.) 14079 28707 62 31 -95
Redside Shiner (Richardsonius balteatus) 0 0 357 52 - 113
Sculpin (Cottus spp.) 5 4 53 46 -223
Exotic Kokanee (Oncorhynchus nerka) 400 0 0 42 - 165
Bass (Micropterus spp.) 0 8 160 30 - 475 Walleye (Sander vitreus) 0 0 26 187 - 755
White Crappie (Pomoxis annularis) 0 0 271 47 - 380 Black Crappie (Pomoxis nigromaculatus) 0 0 6 75 - 290
Bluegill (Lepomis macrochirus) 127 0 11 53 - 170 Pumpkinseed (Lepomis gibbosus) 5297 0 3 64 - 135
Brown Bullhead (Ameiurus nebulosus) 254 0 89 25 - 395 Yellow Bullhead (Ameiurus natalis) 0 0 9 120 - 260
Lookout Point Reservoir
470 mm, 18.5 in.
755 mm, 29.7 in.
USGS 2004
Copepods •Salmincola prevalence appears to increase with the duration
of time spent in reservoirs. • Copepod infection seems rare in stream-rearing juveniles.
•Need information on how copepods affect saltwater transition (physiology, parasitology). •Need standardized protocol to record intensity of infection. •Are fish infected in the reservoir? •Do Salmincola negatively affect survival?
Species Composition •Large abundance of piscivorous predators in Lookout Point Reservoir.
•Currently processing diet samples collected in Spring and Fall 2011.
•Drawdown in Lookout Point could decrease abundance of predatory fish. •Downstream effects ?
•Detroit Reservoir - Hatchery Rainbow Trout prey on juvenile Chinook •stream, reservoir, below the dam
Doug Garletts Chad Helms Greg Taylor Rich Piaskowski
Jeff Ziller
Randy Wildman
The ‘Reservoir Dogs’ Khoury Hickman David Duckett Chris Abbes Dave Metz Kris Clemons Shelly Goff Greg Gilham Mario Minder
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Apr May Jun Jul Aug Sept Oct Nov
Cougar
Detroit
Lookout
Cougar
Detroit
Lookout
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